// This file is part of OpenTSDB.
// Copyright (C) 2010-2012  The OpenTSDB Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 2.1 of the License, or (at your
// option) any later version.  This program is distributed in the hope that it
// will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
// General Public License for more details.  You should have received a copy
// of the GNU Lesser General Public License along with this program.  If not,
// see <http://www.gnu.org/licenses/>.
package net.opentsdb.core;

import java.util.Arrays;

/**
 * Helper functions to deal with the row key.
 */
final class RowKey {

    private RowKey() {
        // Can't create instances of this utility class.
    }

    /**
     * Extracts the name of the metric ID contained in a row key.
     *
     * @param tsdb The TSDB to use.
     * @param row  The actual row key.
     * @return The name of the metric.
     */
    static String metricName(final TSDB tsdb, final byte[] row) {
        final byte[] id = Arrays.copyOfRange(row, 0, tsdb.metrics.width());
        return tsdb.metrics.getName(id);
    }

}
